Handle multiple desktop files in different dirs.

Other cleanups.
Command line option --no-desktop introduced.
(desktop-read): Record buffers in the desktop file in
the same order as that in the buffer list,
(desktop-save): Put buffers in the order given in desktop file,
regardless of what handlers do.
(desktop-file-version): New variable. Version number of desktop
file format.
(desktop-create-buffer-form): Variable deleted.
(desktop-save): New customizable variable.
(desktop-kill): Changed to use `desktop-save'.
(desktop-file-name-format): New option: format in
which desktop file names should be saved.
(desktop-file-name): New function to convert a filename to the
format specified in `desktop-file-name-format'.
(desktop-create-buffer): Parameters renamed to descriptive
systematic names. These parameters are visible to handlers.
Renames:
ver    -> desktop-file-version
mim    -> desktop-buffer-minor-modes
pt     -> desktop-buffer-point
mk     -> desktop-buffer-mark
ro     -> desktop-buffer-read-only
locals -> desktop-buffer-locals
(desktop-buffer-major-mode, desktop-buffer-file-name)
(desktop-buffer-name): Unused customizable variables deleted.
(desktop-buffer-misc): Unused variable deleted.
(desktop-save, desktop-buffer-dired-misc-data):
Use `desktop-file-name'.
(desktop-path): New customizable variable.  List of directories in
which to lookup the desktop file. Replaces hardcoded list.
(desktop-globals-to-clear): New variable replaces hardcoded list.
(desktop-clear-preserve-buffers-regexp): New customizable variable.
(desktop-after-read-hook): New hook run after a desktop is read.
(desktop-no-desktop-file-hook): New hook when no desktop file found.
(desktop-change-dir): New function.
(desktop-save-in-load-dir): New function. Save desktop in
directory from witch it was loaded.
(desktop-revert): New function. Revert to the last loaded desktop.

1 files changed, 449 insertions, 247 deletions

diff --git a/lisp/desktop.el b/lisp/desktop.el
index 11665272f88..197680470ee 100644
--- a/lisp/desktop.el
+++ b/lisp/desktop.el
@@ -99,7 +99,6 @@
 ;; Save window configuration.
 ;; Recognize more minor modes.
 ;; Save mark rings.
-;; Start-up with buffer-menu???
 
 ;;; Code:
 
@@ -108,6 +107,12 @@
   ;; We use functions from these modules
   ;; We can't (require 'mh-e) since that wants to load something.
   (mapcar 'require '(info dired reporter)))
+
+(defvar desktop-file-version "206"
+  "Verion number of desktop file format.
+Written into the desktop file and used at desktop read to provide
+backward compatibility.")
+
 ;; ----------------------------------------------------------------------------
 ;; USER OPTIONS -- settings you might want to play with.
 ;; ----------------------------------------------------------------------------
@@ -124,45 +129,113 @@
   :initialize 'custom-initialize-default
   :version "20.3")
 
-(defcustom desktop-basefilename
+(defcustom desktop-save 'ask-if-new
+  "*When the user changes desktop or quits emacs, should the desktop be saved?
+\(in the current desktop directory)
+   t             -- always save.
+   ask           -- always ask.
+   ask-if-new    -- ask if no desktop file exists, otherwise just save.
+   ask-if-exists -- ask if desktop file exists, otherwise don't save.
+   if-exists     -- save if desktop file exists, otherwise don't save.
+   nil           -- never save.
+The desktop is never saved when `desktop-enable' is nil."
+  :type '(choice
+    (const :tag "Always save" t)
+    (const :tag "Always ask" ask)
+    (const :tag "Ask if desktop file is new, else do save" ask-if-new)
+    (const :tag "Ask if desktop file exists, else don't save" ask-if-exists)
+    (const :tag "Save if desktop file exists, else don't" if-exists)
+    (const :tag "Never save" nil))
+  :group 'desktop)
+
+(defcustom desktop-base-file-name
   (convert-standard-filename ".emacs.desktop")
   "File for Emacs desktop, not including the directory name."
   :type 'file
   :group 'desktop)
 
+(defcustom desktop-path '("." "~")
+  "List of directories to search for the desktop file.
+The base name of the file is specified in `desktop-base-file-name'."
+  :type '(repeat directory)
+  :group 'desktop)
+
 (defcustom desktop-missing-file-warning nil
   "*If non-nil then desktop warns when a file no longer exists.
 Otherwise it simply ignores that file."
   :type 'boolean
   :group 'desktop)
 
-(defvar desktop-globals-to-save
-  (list 'desktop-missing-file-warning
-        ;; Feature: saving kill-ring implies saving kill-ring-yank-pointer
-        ;; 'kill-ring
-        'tags-file-name
-        'tags-table-list
-        'search-ring
-        'regexp-search-ring
-        'register-alist
-        ;; 'desktop-globals-to-save     ; Itself!
-        )
+(defcustom desktop-no-desktop-file-hook nil
+  "Normal hook run after fail of `desktop-read' due to missing desktop file.
+May e.g. be used to show a dired buffer."
+  :type 'hook
+  :group 'desktop)
+
+(defcustom desktop-after-read-hook nil
+  "Normal hook run after a sucessful `desktop-read'.
+May e.g. be used to show a buffer list."
+  :type 'hook
+  :group 'desktop)
+
+(defcustom desktop-save-hook nil
+  "Hook run before desktop saves the state of Emacs.
+This is useful for truncating history lists, for example."
+  :type 'hook
+  :group 'desktop)
+
+(defcustom desktop-globals-to-save '(
+  desktop-missing-file-warning
+  tags-file-name
+  tags-table-list
+  search-ring
+  regexp-search-ring
+  register-alist)
   "List of global variables to save when killing Emacs.
 An element may be variable name (a symbol)
 or a cons cell of the form  (VAR . MAX-SIZE),
 which means to truncate VAR's value to at most MAX-SIZE elements
-\(if the value is a list) before saving the value.")
-
-(defvar desktop-locals-to-save
-  (list 'desktop-locals-to-save         ; Itself!  Think it over.
-        'truncate-lines
-        'case-fold-search
-        'case-replace
-        'fill-column
-        'overwrite-mode
-        'change-log-default-name
-        'line-number-mode
-        )
+\(if the value is a list) before saving the value.
+Feature: Saving `kill-ring' implies saving `kill-ring-yank-pointer'."
+  :type '(repeat (restricted-sexp :match-alternatives (symbolp consp)))
+  :group 'desktop)
+
+(defcustom desktop-globals-to-clear '(
+  kill-ring
+  kill-ring-yank-pointer
+  search-ring
+  search-ring-yank-pointer
+  regexp-search-ring
+  regexp-search-ring-yank-pointer)
+  "List of global variables set to clear by `desktop-clear'.
+An element may be variable name (a symbol) or a cons cell of the form
+\(VAR . FORM). Symbols are set to nil and for cons cells VAR is set
+to the value obtained by evaluateing FORM."
+  :type '(repeat (restricted-sexp :match-alternatives (symbolp consp)))
+  :group 'desktop)
+
+(defcustom desktop-clear-preserve-buffers-regexp
+  "^\\*tramp/.+\\*$"
+  "Regexp identifying buffers that `desktop-clear' should not delete."
+  :type 'regexp
+  :group 'desktop)
+
+;; Maintained for backward compatibility
+(defcustom desktop-clear-preserve-buffers
+  '("*scratch*" "*Messages*")
+  "*List of buffer names that `desktop-clear' should not delete."
+  :type '(repeat string)
+  :group 'desktop)
+
+(defvar desktop-locals-to-save '(
+  desktop-locals-to-save  ; Itself!  Think it over.
+  truncate-lines
+  case-fold-search
+  case-replace
+  fill-column
+  overwrite-mode
+  change-log-default-name
+  line-number-mode)
   "List of local variables to save for each buffer.
 The variables are saved only when they really are local.")
 (make-variable-buffer-local 'desktop-locals-to-save)
@@ -171,10 +244,10 @@ The variables are saved only when they really are local.")
 ;;         (ftp) files because they require passwords and whatnot.
 ;;         TAGS files to save time (tags-file-name is saved instead).
 (defcustom desktop-buffers-not-to-save
- "\\(^nn\\.a[0-9]+\\|\\.log\\|(ftp)\\|^tags\\|^TAGS\\)$"
- "Regexp identifying buffers that are to be excluded from saving."
- :type 'regexp
- :group 'desktop)
+  "\\(^nn\\.a[0-9]+\\|\\.log\\|(ftp)\\|^tags\\|^TAGS\\)$"
+  "Regexp identifying buffers that are to be excluded from saving."
+  :type 'regexp
+  :group 'desktop)
 
 ;; Skip ange-ftp files
 (defcustom desktop-files-not-to-save
@@ -196,25 +269,15 @@ whether the buffer should be recreated or not, and how."
   :type '(repeat symbol)
   :group 'desktop)
 
-(defcustom desktop-buffer-major-mode nil
-  "When desktop creates a buffer, this holds the desired Major mode."
-  :type 'symbol
+(defcustom desktop-file-name-format 'absolute
+  "*Format in which desktop file names should be saved.
+Possible values are:
+   absolute -- Absolute file name.
+   tilde    -- Relative to ~.
+   local    -- Relative to directory of desktop file."
+  :type '(choice (const absolute) (const tilde) (const local))
   :group 'desktop)
 
-(defcustom desktop-buffer-file-name nil
-  "When desktop creates a buffer, this holds the file name to visit."
-  :type '(choice file (const nil))
-  :group 'desktop)
-
-(defcustom desktop-buffer-name nil
-  "When desktop creates a buffer, this holds the desired buffer name."
-  :type '(choice string (const nil))
-  :group 'desktop)
-
-(defvar desktop-buffer-misc nil
-  "When desktop creates a buffer, this holds a list of misc info.
-It is used by the `desktop-buffer-handlers' functions.")
-
 (defcustom desktop-buffer-misc-functions
   '(desktop-buffer-info-misc-data
     desktop-buffer-dired-misc-data)
@@ -223,6 +286,9 @@ These functions are called in order, with no arguments.  If a function
 returns non-nil, its value is saved along with the desktop buffer for
 which it was called; no further functions will be called.
 
+File names should formatted using the call
+\"(desktop-file-name FILE-NAME dirname)\".
+
 Later, when desktop.el restores the buffers it has saved, each of the
 `desktop-buffer-handlers' functions will have access to a buffer local
 variable, named `desktop-buffer-misc', whose value is what the
@@ -238,8 +304,19 @@ variable, named `desktop-buffer-misc', whose value is what the
     desktop-buffer-file)
   "*List of functions to call in order to create a buffer.
 The functions are called without explicit parameters but can use the
-variables `desktop-buffer-major-mode', `desktop-buffer-file-name',
-`desktop-buffer-name'.
+following variables:
+
+   desktop-file-version
+   desktop-buffer-file-name
+   desktop-buffer-name
+   desktop-buffer-major-mode
+   desktop-buffer-minor-modes
+   desktop-buffer-point
+   desktop-buffer-mark
+   desktop-buffer-read-only
+   desktop-buffer-misc
+   desktop-buffer-locals
+
 If one function returns non-nil, no further functions are called.
 If the function returns a buffer, then the saved mode settings
 and variable values for that buffer are copied into it."
@@ -248,15 +325,6 @@ and variable values for that buffer are copied into it."
 
 (put 'desktop-buffer-handlers 'risky-local-variable t)
 
-(defvar desktop-create-buffer-form "(desktop-create-buffer 205"
-  "Opening of form for creation of new buffers.")
-
-(defcustom desktop-save-hook nil
-  "Hook run before desktop saves the state of Emacs.
-This is useful for truncating history lists, for example."
-  :type 'hook
-  :group 'desktop)
-
 (defcustom desktop-minor-mode-table
   '((auto-fill-function auto-fill-mode)
     (vc-mode nil))
@@ -290,45 +358,61 @@ this table."
   (let ((here (nthcdr (1- n) l)))
     (if (consp here)
         (setcdr here nil))))
-;; ----------------------------------------------------------------------------
-(defcustom desktop-clear-preserve-buffers
-  '("*scratch*" "*Messages*")
-  "*Buffer names that `desktop-clear' should not delete."
-  :type '(repeat string)
-  :group 'desktop)
 
+;; ----------------------------------------------------------------------------
 (defun desktop-clear ()
   "Empty the Desktop.
-This kills all buffers except for internal ones
-and those listed in `desktop-clear-preserve-buffers'."
+This kills all buffers except for internal ones and those listed
+in `desktop-clear-preserve-buffers'.  Furthermore, it clears the
+variables listed in `desktop-globals-to-clear'."
   (interactive)
-  (setq kill-ring nil
-        kill-ring-yank-pointer nil
-        search-ring nil
-        search-ring-yank-pointer nil
-        regexp-search-ring nil
-        regexp-search-ring-yank-pointer nil)
+  (dolist (var desktop-globals-to-clear)
+    (if (symbolp var)
+      (eval `(setq-default ,var nil))
+      (eval `(setq-default ,(car var) ,(cdr var)))))
   (let ((buffers (buffer-list)))
     (while buffers
-      (or (member (buffer-name (car buffers)) desktop-clear-preserve-buffers)
-          (null (buffer-name (car buffers)))
-          ;; Don't kill buffers made for internal purposes.
-          (and (not (equal (buffer-name (car buffers)) ""))
-               (eq (aref (buffer-name (car buffers)) 0) ?\ ))
-          (kill-buffer (car buffers)))
+      (let ((bufname (buffer-name (car buffers))))
+         (or
+           (null bufname)
+           (string-match desktop-clear-preserve-buffers-regexp bufname)
+           (member bufname desktop-clear-preserve-buffers)
+           ;; Don't kill buffers made for internal purposes.
+           (and (not (equal bufname "")) (eq (aref bufname 0) ?\ ))
+           (kill-buffer (car buffers))))
       (setq buffers (cdr buffers))))
   (delete-other-windows))
+
 ;; ----------------------------------------------------------------------------
 (add-hook 'kill-emacs-hook 'desktop-kill)
 
 (defun desktop-kill ()
-  (if desktop-dirname
-      (condition-case err
-          (desktop-save desktop-dirname)
-        (file-error
-         (if (yes-or-no-p "Error while saving the desktop.  Quit anyway? ")
-             nil
-           (signal (car err) (cdr err)))))))
+  "If `desktop-enable' is non-nil, do what `desktop-save' says to do.
+If the desktop should be saved and `desktop-dirname'
+is nil, ask the user where to save the desktop."
+  (when
+    (and
+      desktop-enable
+      (let ((exists (file-exists-p (concat desktop-dirname desktop-base-file-name))))
+        (or
+          (eq desktop-save 't)
+          (and exists (memq desktop-save '(ask-if-new if-exists)))
+          (and
+            (or
+              (memq desktop-save '(ask ask-if-new))
+              (and exists (eq desktop-save 'ask-if-exists)))
+            (y-or-n-p "Save desktop? ")))))
+    (unless desktop-dirname
+      (setq desktop-dirname
+        (expand-file-name
+          (call-interactively
+            (lambda (dir) (interactive "DDirectory for desktop file: ") dir)))))
+    (condition-case err
+      (desktop-save desktop-dirname)
+      (file-error
+        (unless (yes-or-no-p "Error while saving the desktop. Ignore? ")
+          (signal (car err) (cdr err)))))))
+
 ;; ----------------------------------------------------------------------------
 (defun desktop-list* (&rest args)
   (if (null (cdr args))
@@ -341,6 +425,7 @@ and those listed in `desktop-clear-preserve-buffers'."
         (setq args (cdr args)))
       value)))
 
+;; ----------------------------------------------------------------------------
 (defun desktop-internal-v2s (val)
   "Convert VALUE to a pair (QUOTE . TXT); (eval (read TXT)) gives VALUE.
 TXT is a string that when read and evaluated yields value.
@@ -420,6 +505,7 @@ QUOTE may be `may' (value may be quoted),
    (t                                   ; save as text
     (cons 'may "\"Unprintable entity\""))))
 
+;; ----------------------------------------------------------------------------
 (defun desktop-value-to-string (val)
   "Convert VALUE to a string that when read evaluates to the same value.
 Not all types of values are supported."
@@ -431,6 +517,7 @@ Not all types of values are supported."
     (if (eq quote 'must)
         (concat "'" txt)
       txt)))
+
 ;; ----------------------------------------------------------------------------
 (defun desktop-outvar (varspec)
   "Output a setq statement for variable VAR to the desktop file.
@@ -453,6 +540,7 @@ which means to truncate VAR's value to at most MAX-SIZE elements
                   " "
                   (desktop-value-to-string (symbol-value var))
                   ")\n")))))
+
 ;; ----------------------------------------------------------------------------
 (defun desktop-save-buffer-p (filename bufname mode &rest dummy)
   "Return t if the desktop should record a particular buffer for next startup.
@@ -470,137 +558,157 @@ MODE is the major mode."
                                        default-directory))))
              (and (null filename)
                   (memq mode desktop-buffer-modes-to-save))))))
+
 ;; ----------------------------------------------------------------------------
-(defcustom desktop-relative-file-names nil
-  "*Store relative file names in the desktop file."
-  :type 'boolean
-  :group 'desktop)
+(defun desktop-file-name (filename dirname)
+  "Convert FILENAME to format specified in `desktop-file-name-format'.
+DIRNAME must be the directory in which the desktop file will be saved."
+  (cond
+    ((not filename) nil)
+    ((eq desktop-file-name-format 'tilde)
+     (let ((relative-name (file-relative-name (expand-file-name filename) "~")))
+       (cond
+         ((file-name-absolute-p relative-name) relative-name)
+         ((string= "./" relative-name) "~/")
+         ((string= "." relative-name) "~")
+         (t (concat "~/" relative-name)))))
+    ((eq desktop-file-name-format 'local) (file-relative-name filename dirname))
+    (t (expand-file-name filename))))
 
+;; ----------------------------------------------------------------------------
 (defun desktop-save (dirname)
-  "Save the Desktop file.  Parameter DIRNAME specifies where to save desktop."
+  "Save the Desktop file. Parameter DIRNAME specifies where to save desktop."
   (interactive "DDirectory to save desktop file in: ")
   (run-hooks 'desktop-save-hook)
   (save-excursion
-    (let ((filename (expand-file-name desktop-basefilename dirname))
-          (info (nreverse
-                 (mapcar
-                  (function
-                   (lambda (b)
-                    (set-buffer b)
-                    (list
-                     (let ((bn (buffer-file-name)))
-                       (if bn
-                           (if desktop-relative-file-names
-                               (file-relative-name bn dirname)
-                             bn)))
-                     (buffer-name)
-                     major-mode
-                     ;; minor modes
-                     (let (ret)
-                       (mapcar
-                        #'(lambda (mim)
-                            (and (boundp mim)
-                                 (symbol-value mim)
-                                 (setq ret
-                                       (cons (let ((special (assq mim desktop-minor-mode-table)))
-                                               (if special
-                                                   (cadr special)
-                                                 mim))
-                                             ret))))
-                        (mapcar #'car minor-mode-alist))
-                       ret)
-                     (point)
-                     (list (mark t) mark-active)
-                     buffer-read-only
-                     (run-hook-with-args-until-success
-                      'desktop-buffer-misc-functions)
-                     (let ((locals desktop-locals-to-save)
-                           (loclist (buffer-local-variables))
-                           (ll))
-                       (while locals
-                         (let ((here (assq (car locals) loclist)))
-                           (if here
-                               (setq ll (cons here ll))
-                             (if (member (car locals) loclist)
-                                 (setq ll (cons (car locals) ll)))))
-                         (setq locals (cdr locals)))
-                       ll)
-                     )))
-                  (buffer-list))))
-          (buf (get-buffer-create "*desktop*")))
+    (let ((filename (expand-file-name desktop-base-file-name dirname))
+      (info
+        (mapcar
+          (function
+            (lambda (b)
+              (set-buffer b)
+              (list
+                (desktop-file-name (buffer-file-name) dirname)
+                (buffer-name)
+                major-mode
+                ;; minor modes
+                (let (ret)
+                  (mapcar
+                    #'(lambda (mim)
+                      (and
+                        (boundp mim)
+                        (symbol-value mim)
+                        (setq
+                          ret
+                          (cons
+                            (let (
+                              (special (assq mim desktop-minor-mode-table))
+                            )
+                              (if special (cadr special) mim))
+                            ret))))
+                    (mapcar #'car minor-mode-alist))
+                  ret)
+                (point)
+                (list (mark t) mark-active)
+                buffer-read-only
+                (run-hook-with-args-until-success 'desktop-buffer-misc-functions)
+                (let (
+                  (locals desktop-locals-to-save)
+                  (loclist (buffer-local-variables))
+                  (ll)
+                )
+                  (while locals
+                    (let ((here (assq (car locals) loclist)))
+                      (if here
+                        (setq ll (cons here ll))
+                        (when (member (car locals) loclist)
+                          (setq ll (cons (car locals) ll)))))
+                    (setq locals (cdr locals)))
+                  ll))))
+          (buffer-list)))
+      (buf (get-buffer-create "*desktop*")))
       (set-buffer buf)
       (erase-buffer)
 
-      (insert ";; -*- coding: emacs-mule; -*-\n"
-              desktop-header
-              ";; Created " (current-time-string) "\n"
-              ";; Emacs version " emacs-version "\n\n"
-              ";; Global section:\n")
+      (insert
+        ";; -*- coding: emacs-mule; -*-\n"
+        desktop-header
+        ";; Created " (current-time-string) "\n"
+        ";; Desktop file format version " desktop-file-version "\n"
+        ";; Emacs version " emacs-version "\n\n"
+        ";; Global section:\n")
       (mapcar (function desktop-outvar) desktop-globals-to-save)
       (if (memq 'kill-ring desktop-globals-to-save)
-          (insert "(setq kill-ring-yank-pointer (nthcdr "
-                  (int-to-string
-                   (- (length kill-ring) (length kill-ring-yank-pointer)))
-                  " kill-ring))\n"))
+        (insert
+          "(setq kill-ring-yank-pointer (nthcdr "
+          (int-to-string (- (length kill-ring) (length kill-ring-yank-pointer)))
+          " kill-ring))\n"))
 
-      (insert "\n;; Buffer section:\n")
+      (insert "\n;; Buffer section -- buffers listed in same order as in buffer list:\n")
       (mapcar
-       (function (lambda (l)
-         (if (apply 'desktop-save-buffer-p l)
-             (progn
-               (insert desktop-create-buffer-form)
-               (mapcar
-                (function (lambda (e)
-                  (insert "\n  "
-                          (desktop-value-to-string e))))
-                l)
-               (insert ")\n\n")))))
-       info)
+        (function
+          (lambda (l)
+            (if (apply 'desktop-save-buffer-p l)
+              (progn
+                (insert "(desktop-create-buffer " desktop-file-version)
+                (mapcar
+                  (function
+                    (lambda (e)
+                      (insert "\n  " (desktop-value-to-string e))))
+                  l)
+                (insert ")\n\n")))))
+        info)
       (setq default-directory dirname)
-      (if (file-exists-p filename) (delete-file filename))
+      (when (file-exists-p filename) (delete-file filename))
       (let ((coding-system-for-write 'emacs-mule))
-        (write-region (point-min) (point-max) filename nil 'nomessage))))
+        (write-region (point-min) (point-max) filename nil 'nomessage))))
   (setq desktop-dirname dirname))
+
 ;; ----------------------------------------------------------------------------
 (defun desktop-remove ()
   "Delete the Desktop file and inactivate the desktop system."
   (interactive)
   (if desktop-dirname
-      (let ((filename (concat desktop-dirname desktop-basefilename)))
+      (let ((filename (concat desktop-dirname desktop-base-file-name)))
         (setq desktop-dirname nil)
         (if (file-exists-p filename)
             (delete-file filename)))))
+
 ;; ----------------------------------------------------------------------------
 ;;;###autoload
 (defun desktop-read ()
   "Read the Desktop file and the files it specifies.
-This is a no-op when Emacs is running in batch mode."
+This is a no-op when Emacs is running in batch mode.
+Look for the desktop file according to the variables `desktop-base-file-name'
+and `desktop-path'.  If no desktop file is found, clear the desktop.
+Returns t if it has read a desktop file, nil otherwise."
   (interactive)
-  (if noninteractive
-      nil
-    (let ((dirs '("./" "~/")))
-      (while (and dirs
-                  (not (file-exists-p (expand-file-name
-                                       desktop-basefilename
-                                       (car dirs)))))
-        (setq dirs (cdr dirs)))
+  (unless noninteractive
+    (let ((dirs desktop-path))
+      (while
+        (and
+          dirs
+          (not
+            (file-exists-p (expand-file-name desktop-base-file-name (car dirs)))))
+        (setq dirs (cdr dirs)))
       (setq desktop-dirname (and dirs (expand-file-name (car dirs))))
       (if desktop-dirname
-          (let ((desktop-last-buffer nil))
-            ;; `load-with-code-conversion' calls `eval-buffer' which
-            ;; contains a `save-excursion', so we end up with the same
-            ;; buffer before and after the load.  This is a problem
-            ;; when the desktop is read initially when Emacs starts up
-            ;; because, if we still are in *scratch* after running
-            ;; `after-init-hook', the splash screen will be displayed.
-            (load (expand-file-name desktop-basefilename desktop-dirname)
-                  t t t)
-            (when desktop-last-buffer
-              (switch-to-buffer desktop-last-buffer))
-            (run-hooks 'desktop-delay-hook)
-            (setq desktop-delay-hook nil)
-            (message "Desktop loaded."))
-        (desktop-clear)))))
+        (let ((desktop-first-buffer nil))
+          ;; `desktop-create-buffer' sets `desktop-first-buffer' to the first
+          ;; buffer in the desktop file (the last for desktop files written
+          ;; by desktop version prior to 206).
+          (load (expand-file-name desktop-base-file-name desktop-dirname) t t t)
+          (when desktop-first-buffer (switch-to-buffer desktop-first-buffer))
+          (run-hooks 'desktop-delay-hook)
+          (setq desktop-delay-hook nil)
+          (run-hooks 'desktop-after-read-hook)
+          (message "Desktop loaded.")
+          t)
+        (desktop-clear)
+        (run-hooks 'desktop-no-desktop-file-hook)
+        (message "No desktop file.")
+        nil))))
+
 ;; ----------------------------------------------------------------------------
 ;;;###autoload
 (defun desktop-load-default ()
@@ -611,24 +719,74 @@ to provide correct modes for autoloaded files."
       (progn
         (load "default" t t)
         (setq inhibit-default-init t))))
+
+;; ----------------------------------------------------------------------------
+;;;###autoload
+(defun desktop-change-dir (dir)
+  "Save and clear the desktop, then load the desktop from directory DIR.
+However, if `desktop-enable' was nil at call, don't save the old desktop.
+This function always sets `desktop-enable' to t."
+  (interactive "DNew directory: ")
+  (desktop-kill)
+  (desktop-clear)
+  (cd dir)
+  (setq desktop-enable t)
+  (let ((desktop-path '(".")))
+    (desktop-read)
+    ;; Set `desktop-dirname' even in no desktop file was found
+    (setq desktop-dirname (expand-file-name dir))))
+
+;; ----------------------------------------------------------------------------
+;;;###autoload
+(defun desktop-save-in-load-dir ()
+  "Save desktop in directory from which it was loaded."
+  (interactive)
+  (if desktop-dirname
+    (desktop-save desktop-dirname)
+    (call-interactively 'desktop-save))
+  (message "Desktop saved in %s" desktop-dirname))
+
+;; ----------------------------------------------------------------------------
+;;;###autoload
+(defun desktop-revert ()
+  "Revert to the last loaded desktop."
+  (interactive)
+  (unless desktop-dirname (error "No desktop has been loaded"))
+  (setq desktop-enable nil)
+  (desktop-change-dir desktop-dirname))
+
 ;; ----------------------------------------------------------------------------
 ;; Note: the following functions use the dynamic variable binding in Lisp.
 ;;
+
+(eval-when-compile ; Just to silence the byte compiler
+  (defvar desktop-file-version)
+  (defvar desktop-buffer-file-name)
+  (defvar desktop-buffer-name)
+  (defvar desktop-buffer-major-mode)
+  (defvar desktop-buffer-minor-modes)
+  (defvar desktop-buffer-point)
+  (defvar desktop-buffer-mark)
+  (defvar desktop-buffer-read-only)
+  (defvar desktop-buffer-misc)
+  (defvar desktop-buffer-locals)
+)
+
 (defun desktop-buffer-info-misc-data ()
   (if (eq major-mode 'Info-mode)
       (list Info-current-file
             Info-current-node)))
 
+;; ----------------------------------------------------------------------------
 (defun desktop-buffer-dired-misc-data ()
-  (if (eq major-mode 'dired-mode)
-      (cons
-       (expand-file-name dired-directory)
-       (cdr
-        (nreverse
-         (mapcar
-          (function car)
-          dired-subdir-alist))))))
+  (when (eq major-mode 'dired-mode)
+    (eval-when-compile (defvar dirname))
+    (cons
+      ;; dired directory in portable form
+      (file-name-as-directory (desktop-file-name dired-directory dirname))
+      (cdr (nreverse (mapcar (function car) dired-subdir-alist))))))
 
+;; ----------------------------------------------------------------------------
 (defun desktop-buffer-info () "Load an info file."
   (if (eq 'Info-mode desktop-buffer-major-mode)
       (progn
@@ -638,7 +796,9 @@ to provide correct modes for autoloaded files."
           (require 'info)
           (Info-find-node first second)
           (current-buffer))))))
+
 ;; ----------------------------------------------------------------------------
+(eval-when-compile (defvar rmail-buffer)) ; Just to silence the byte compiler.
 (defun desktop-buffer-rmail () "Load an RMAIL file."
   (if (eq 'rmail-mode desktop-buffer-major-mode)
       (condition-case error
@@ -649,14 +809,16 @@ to provide correct modes for autoloaded files."
         (file-locked
          (kill-buffer (current-buffer))
          'ignored))))
+
 ;; ----------------------------------------------------------------------------
 (defun desktop-buffer-mh () "Load a folder in the mh system."
   (if (eq 'mh-folder-mode desktop-buffer-major-mode)
       (progn
-        (require 'mh-e)
+        (eval-and-compile (require 'mh-e))
         (mh-find-path)
         (mh-visit-folder desktop-buffer-name)
         (current-buffer))))
+
 ;; ----------------------------------------------------------------------------
 (defun desktop-buffer-dired () "Load a directory using dired."
   (if (eq 'dired-mode desktop-buffer-major-mode)
@@ -668,6 +830,7 @@ to provide correct modes for autoloaded files."
         (message "Directory %s no longer exists." (car desktop-buffer-misc))
         (sit-for 1)
         'ignored)))
+
 ;; ----------------------------------------------------------------------------
 (defun desktop-buffer-file () "Load a file."
   (if desktop-buffer-file-name
@@ -682,56 +845,89 @@ to provide correct modes for autoloaded files."
               (error (pop-to-buffer buf)))
             buf)
         'ignored)))
+
 ;; ----------------------------------------------------------------------------
 ;; Create a buffer, load its file, set is mode, ...;  called from Desktop file
 ;; only.
 
-(defvar desktop-last-buffer nil
-  "Last buffer read.  Dynamically bound in `desktop-read'.")
-
-(defun desktop-create-buffer (ver desktop-buffer-file-name desktop-buffer-name
-                                  desktop-buffer-major-mode
-                                  mim pt mk ro desktop-buffer-misc
-                                  &optional locals)
-  (let ((hlist desktop-buffer-handlers)
-        (result)
-        (handler))
-    (while (and (not result) hlist)
-      (setq handler (car hlist))
-      (setq result (funcall handler))
-      (setq hlist (cdr hlist)))
-    (when (bufferp result)
-      (setq desktop-last-buffer result)
-      (set-buffer result)
-      (if (not (equal (buffer-name) desktop-buffer-name))
-          (rename-buffer desktop-buffer-name))
-      ;; minor modes
-      (cond ((equal '(t) mim)   (auto-fill-mode 1))     ; backwards compatible
-            ((equal '(nil) mim) (auto-fill-mode 0))
-            (t (mapcar #'(lambda (minor-mode)
-                           (when (functionp minor-mode)
-                             (funcall minor-mode 1)))
-                       mim)))
-      (goto-char pt)
-      (if (consp mk)
-          (progn
-            (set-mark (car mk))
-            (setq mark-active (car (cdr mk))))
-        (set-mark mk))
-      ;; Never override file system if the file really is read-only marked.
-      (if ro (setq buffer-read-only ro))
-      (while locals
-        (let ((this (car locals)))
-          (if (consp this)
-              ;; an entry of this form `(symbol . value)'
-              (progn
-                (make-local-variable (car this))
-                (set (car this) (cdr this)))
-            ;; an entry of the form `symbol'
-            (make-local-variable this)
-            (makunbound this)))
-        (setq locals (cdr locals))))))
+(eval-when-compile ; Just to silence the byte compiler
+   (defvar desktop-first-buffer) ;; Dynamically bound in `desktop-read'
+)
+
+(defun desktop-create-buffer (
+  desktop-file-version
+  desktop-buffer-file-name
+  desktop-buffer-name
+  desktop-buffer-major-mode
+  desktop-buffer-minor-modes
+  desktop-buffer-point
+  desktop-buffer-mark
+  desktop-buffer-read-only
+  desktop-buffer-misc
+  &optional
+  desktop-buffer-locals)
+  ;; To make desktop files with relative file names possible, we cannot
+  ;; allow `default-directory' to change. Therefore we save current buffer.
+  (save-current-buffer
+    (let (
+      (buffer-list (buffer-list))
+      (hlist desktop-buffer-handlers)
+      (result)
+      (handler)
+    )
+      ;; Call desktop-buffer-handlers to create buffer.
+      (while (and (not result) hlist)
+        (setq handler (car hlist))
+        (setq result (funcall handler))
+        (setq hlist (cdr hlist)))
+      (unless (bufferp result) (setq result nil))
+      (unless (< desktop-file-version 206)
+        (when result (setq buffer-list (cons result buffer-list)))
+        (mapcar 'bury-buffer buffer-list))
+      (when result
+        (if (< desktop-file-version 206)
+          (setq desktop-first-buffer result)
+          (bury-buffer result))
+        (unless desktop-first-buffer (setq desktop-first-buffer result))
+        (set-buffer result)
+        (unless (equal (buffer-name) desktop-buffer-name)
+          (rename-buffer desktop-buffer-name))
+        ;; minor modes
+        (cond (
+          ;; backwards compatible
+          (equal '(t) desktop-buffer-minor-modes)
+          (auto-fill-mode 1))(
+          (equal '(nil) desktop-buffer-minor-modes)
+          (auto-fill-mode 0))(
+          t
+          (mapcar
+            #'(lambda (minor-mode)
+              (when (functionp minor-mode) (funcall minor-mode 1)))
+            desktop-buffer-minor-modes)))
+        ;; Even though point and mark are non-nil when written by `desktop-save'
+        ;; they may be modified by mandlers wanting to set point or mark themselves.
+        (when desktop-buffer-point (goto-char desktop-buffer-point))
+        (when desktop-buffer-mark
+          (if (consp desktop-buffer-mark)
+            (progn
+              (set-mark (car desktop-buffer-mark))
+              (setq mark-active (car (cdr desktop-buffer-mark))))
+            (set-mark desktop-buffer-mark)))
+        ;; Never override file system if the file really is read-only marked.
+        (if desktop-buffer-read-only (setq buffer-read-only desktop-buffer-read-only))
+        (while desktop-buffer-locals
+          (let ((this (car desktop-buffer-locals)))
+            (if (consp this)
+              ;; an entry of this form `(symbol . value)'
+              (progn
+                (make-local-variable (car this))
+                (set (car this) (cdr this)))
+              ;; an entry of the form `symbol'
+              (make-local-variable this)
+              (makunbound this)))
+          (setq desktop-buffer-locals (cdr desktop-buffer-locals)))))))
 
+;; ----------------------------------------------------------------------------
 ;; Backward compatibility -- update parameters to 205 standards.
 (defun desktop-buffer (desktop-buffer-file-name desktop-buffer-name
                        desktop-buffer-major-mode
@@ -744,16 +940,22 @@ to provide correct modes for autoloaded files."
                                (cons 'case-fold-search cfs)
                                (cons 'case-replace cr)
                                (cons 'overwrite-mode (car mim)))))
+                               
 ;; ----------------------------------------------------------------------------
-
-;; If the user set desktop-enable to t with Custom,
-;; do the rest of what it takes to use desktop,
-;; but do it after finishing loading the init file.
-(add-hook 'after-init-hook
-          '(lambda ()
-             (when desktop-enable
-               (desktop-load-default)
-               (desktop-read))))
+;; When `desktop-enable' is non-nil and "--no-desktop" is not specified on the
+;; command line, we do the rest of what it takes to use desktop, but do it
+;; after finishing loading the init file.
+;; We cannot use `command-switch-alist' to process "--no-desktop" because these
+;; functions are processed after `after-init-hook'.
+(add-hook
+  'after-init-hook
+  '(lambda ()
+    (let ((key "--no-desktop"))
+      (if (member key command-line-args)
+        (delete key command-line-args)
+        (when desktop-enable
+          (desktop-load-default)
+          (desktop-read))))))
 
 (provide 'desktop)